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RE: [xml-dev] Disk-based XPath Processing

> What you describe in the above para is pretty much exactly 
> what Amara's pushbind and pushdom allow, and the trimxml tool 
> that John L. Clark mentions, exposes this approach on the 
> command line.  They use a subset of XSLT patterns (which are  
> themselves a subset of XPath, as defined int he XSLT 1.0 
> spec) to drive a streamable operation that only loads into 
> memory one subtree at a time from a larget document.

Saxon also allows streamed evaluation of a subset of XPath expressions. The
facility, and the XPath subset, are described at

Michael Kay

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